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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

The password has not been changed on s2.
passwd: Failed preliminary check by password service

[wanch@c103]$ yppasswd
Changing NIS account information for wanch on s2.
Please enter old password:
Changing NIS password for wanch on s2.
Please enter new password:
Please retype new password:
Error while changing the NIS password.
The NIS password has not been changed on s2.

S2 is my NIS master. The service yppasswd is running fine at server end and I can change password at server. I have tried to restart the yp* services at both server and client ends but still unable to find out the fault.